Dura_1021_Computer_Terminal_Users_Manual Dura 1021 Computer Terminal Users Manual

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DURA
1021 Computer Terminal User's Manual

Contents
INTRODUCTION

1

See-Through Card Holder

7

OPERATING PROCEDURES

2

Margin Stops

7

KEYBOARD LAYOUTS

3

Typing Position Indicator

7

CODE CHARTS

4

KEYBOARD CONTROLS

8

OPERATING CONTROLS

5

Power On/Off Switch and Indicator

8

Carrier Return

5

Index Key

8

Interrupt

5

Carrier Return

8

Shift

5

Tab Control

8

NP/NE (Non Print/Non Escape)

5

Shift and Shift Lock

8

Ribbon Shift

5

Multiple Character Keys

8

Reverse Index

5

Backspace

8

First Line.

6

Margin Release

8

Check Function

6

CHANGING TYPE STYLE

9

Timing

6

Front Cover Plate

9

Data Flow Chart

6

CHANGING RIBBON CARTRIDGE

10

TYPEWRITER OPERATION

7

Ribbon Controls

10

PAPER CARRIER CONTROLS

7

CHANGING FILM RIBBON

11

Paper Bail

7

CARE AND CLEANING

12

Platen Variable

7

Platen

12

Paper Guide

7

Deflector Plate

12

Multiple Copy Impression Control

7

Erasure Dustpan

12

Vertical Spacing Control

7

Typing Element

12

Paper Release Lever

7

Index

13

DURA is a trademark of DURA,. Division Intercontinental Systems, Inc.

1021 Computer Terminal
This manual describes the operation and features of
the Model 1021 Computer Terminal and is intended
for the user who will be operating it in conjunction with
a computer or with other terminals. For a more detailed
discussion of its coding - EBCD (Correspondence Selectric sphere) transmission code or EBCD (BCD sphere)
transmission code-computer programming, and acoustical couplers, see the DURA Model 1021 Training
Manual.
The DURA® Model 1021 Computer Terminal combines the reliability and compactness of integrated circuitry with the proven excellence of the high-speed
Selectric printer. Versatility is indicated by the following
features and the optional equipment that is available.
• Compatible with the IBM 2740/41 series conversational terminals so that IBM software can be
used.
• Suitcase-sized so that you can move it from one
location to another, thereby eliminating the installation time loss and costs involved in permanent facilities.

• Can be used to communicate directly with any
other 1021 Computer Terminal.
• Interfaces with DURA Models 260 and 300
Acoustic Data Couplers, Model 103 (A/F) Data
Phone, or any other acoustical coupler meeting
Electronic Industry Association (EIA) standards.
• Prints in upper and lower case at a rate of 175
words per minute. Capable of receiving 15 characters per second asynchronously.
• NON PRINT/NON ESCAPE feature to provide
security of confidential information.
Available with:
• Automatic RIBBON SHIFT for 2-color printout.
• Either REVERSE INDEX for sub and superscripts
in mathematical and chemical equations and formulae or ...
• FIRST LINE feature for automatic vertical tabulation.

1

Operating Procedures
Most systems follow a sequence of operations similar
to the following:
1. Depress power ON/OFF switch to the ON position. In this position, the Model 1021 can be used
as a conventional Selectric typewriter. A light in
the DURA nameplate on the front panel of the
case will glow.
2. Depress LINE ON/OFF switch to ON. In this
position, the Model 1021 can be used to transmit
to or receive from the computer or other terminals.
3. To make contact with the remote computer:
a. When using the DURA 260 or 300 Acoustic
Data Coupler, or any other unit meeting EIA
standards, remove the telephone handset and
dial the number of the computer.
As soon as you have a steady, high-pitched,
continuous tone in the handset, place the handset into the acoustical coupler's receptacle. The
yellow Ready light will glow, indicating that
the terminal is On Line with the computer.
b. When using the Model 103 (A/F) Data Phone,
remove the handset and depress the "Talk"
key. Dial the number of the computer. When
you hear a steady, high-pitched, continuous
tone, depress the DATA key. The Ready light
will glow, indicating that the terminal is On
Line with the computer. The Transmit light will
also be on. The telephone handset now can be
put in the cradle.

2

4. To determine if the computer is ready to receive,
depress the Carrier Return (CR) or the Interrupt
(INTER) key. Either key sends an "End of Transmission" (EOT) code to the computer.
5. The computer will respond with either a message
or an underscore. When the Transmit light goes
on, depress NP /NE and type in the identification
code. (Depress NP /NE or RESET to take you
out of that mode.)
6. Now begin your application.
7. Carrier return to give EOTsignal.
8. After EOT signal, Transmit light goes out and
keyboard locks.
9. Computer now sends an "End of Address" (EOA)
to put the 1021 in receive mode and gives you an
answer to your input.
10. When finished, computer causes an automatic
carrier return, giving EOT signal.
Now repeat from step 6.
Whenever the Transmit light goes on and the keyboard unlocks, you are in control and can transmit.
Conversely, the computer is in control when the Transmit light is off and the keyboard is locked.
NOTE: To communicate between two remote compatible terminals with DURA, Acoustic
Couplers, use either a DURA 300 at one
end and a DURA 260 at the other end, or
use DURA 300 Acoustic Couplers at both
ends with one serving as a "master" and the
other as a "slave."

1021 -"SELECTRIC "KEYBOARD LAYOUT

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2. First Line Key
3, Ribbon Shift Key

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3

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Operating Controls
CARRIER RETURN (CR)

As a typewriter key, depressing the carrier return
key will cause the paper to advance vertically one or
more lines and return to the left margin. However,
when On Line with the computer, the carrier return
key also serves to return control to the computer.
MODE
OFF LINE
ON LINE

CARRIER RETURN FUNCTION
Return carrier
Return carrier, transmit CR code
and EOT code. Lock keyboard,
turn Transmit light off.

INTERRUPT (INTER)

This key has two functions:
1. In the transmit mode, it ends transmit conditions
by sending an EOT code, turning off the Transmit light, and locking the keyboard.
2. In the receive mode, it sends an interrupt signal
(200-millisecond spacing signal used by the IBM
2741) to the remote computer. This signal alerts
the computer. The computer in turn can put the
terminal in a transmit status or can continue sending data. In the latter case, the printer continues
to function and all data is received and printed
out.
SHIFT

The Shift key on the Model 1021 Computer Terminal
functions as a conventional typewriter shift key. The
user can leave the printer in either upper or lower case
when returning control io the remote computer. Likewise the printer may be in upper or lower case when
the computer returns control to the terminal.

take the equipment out of the NP /NE mode, depress
the NP /NE key again.
RIBBON SHIFT

This optional feature is available for two modes of
operation. In one mode, the color of the printout is
controlled by the user. In the other mode, the ribbon
is shifted automatically to print all received data in red.
When the key is depressed in the first mode, a code is
transmitted that alternately causes the Ribbon Shift to
pick and drop. This code may be received as well as
transmitted. No code is necessary for the second mode
of operation.
REVERSE INDEX

This optional feature is desirable for sending or receiving chemical formulae, charts, graphs, or mathematical operations. The REVERSE INDEX function,
whether operated by depressing a key on the keyboard,
or by a code from the line, always causes the platen to
move lh vertical space upward so that a superscript can
be printed. The Vertical Spacing Control lever must be
adjusted to half-space position to provide spacing, via
the Index key, of lh space to return the platen to the
typing line. The Index key can also be used for the
insertion of subscripts. The Index and the Reverse Index each require "two character times" to be completed.

NP/NE (Non Print/Non Escape)

This standard feature enables the user to maintain
security on information such as identification code, job
code, and account numbers which might make it possible for others to query the computer for confidential
data. In the ON position (indicated by a yellow light),
the printing of any of the 44 characters (A, B, C, etc.)
transmitted is inhibited. Operation of the control keys
(shift, TAB, etc.) is not affected. Depression of the
NP /NE key affects the printers in the local terminal, all
remote terminals, and in the originating terminal. To

5

FIRST LINE (Vertical Tabulation)

terminal does not send an interrupt signal. When the
terminal is in the transmitting mode, the check light
will go on if an interrupt signal (200-millisecond spacing) is received. In the transmitting mode, the user can
return control to the remote system by depressing the
reset, then either the Carrier Return or the Interrupt
key. The user must not turn off the check light by depressing the Reset key unless the transmit light is on.

This optional feature is desirable when working with
continuous forms, such as with a forms tractor. The
function of this key is to provide automatic indexing of
the paper in the printer until pre-set stops are reached.
A cam-operated switch in the forms tractor senses that
the appropriate. stop has been reached and stops the
indexing at the "First Line" position. The time required to complete the indexing operation is determined
by the number of indexes required; each index takes
two character times. The First Line code can be generated by the key or received On Line. After receiving
First Line code, indexing occurs, and upon completion
the terminal will transmit an EaT code.

TIMING CONSIDERATIONS

In the software, time must be allowed for the mechanical fun~tions of the printer to be completed before
additional character information is transmitted. The
amount of time, expressed in terms of "character times,"
is given by the following formulae:

CHECK FUNCTION

When the terminal is in the reCeIVIng mode, the
check light will go on if a received code is a parity
error, or if the printer is unable to keep up with or
follow the incoming data. Any character that is a parity
error prints out as a period, and the check light glows.
The terminal will automatically transmit an interrupt
signal back to the computer (which causes it to stop
sending), and the keyboard remains locked. On special
order, the 1021 terminal can be wired so that the

SERIALIZER
RECEIVE
CONTROL

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..

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~

.PRINTER
~
INTERLOCK

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.
F

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MAGNETS

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.

PRINT
OPTIONAL
FEATURES

.

& EOT

I----

Data flow for MODEL 1021 Computer Terminal

6

N=T+1.5
N=T+1.5
N=2
N=2
N=l

where N = number of character times required, and
T = number of inches of carrier travel. Answers should
be rounded off to the next highest whole number.

CLOCK

KEYBOARD
SWITCHES

RECEIVE
SHIFT REG.
& OUTPUT
GATES

CARRIER RETURN
TAB
INDEX/REVERSE INDEX (1 each)
FIRST LINE (each Index)
RIBBON SHIFT

EOA
CONTROL

Typewriter Operation
PAPER CARRIER CONTROLS
Paper Bail

position for an original and five or more carbon copies.

Move forward when inserting paper. Release it to hold
the paper against the platen.

Vertical Spacing Control Lever

Platen Variable

Push in on the left platen knob and the platen can be
rotated freely in either direction to adjust the printing line.
This is particularly useful when a typed page is being reinserted for additions or corrections.
Paper Guide

Position by sliding it to the left or right. When inserting a new sheet of paper, place the left edge of the
paper against the paper guide and turn the platen knob
to feed in the paper. This procedure will ensure uniform
left margins.
Multiple Copy Impression Control Lever

Move the lever toward the rear to compensate for multiple carbon copies or heavy paper. This ensures that the typing element will continue to strike the paper squarely. There
are five lever positions. Typical settings are the second position for an original and three carbon copies and the third

Permits you to select either single or double spacing of
the platen.
Paper Release Lever

Move forward when removing or adjusting paper.
See-Through Card Holder

The clear plastic holder permits you to see as you type.
It also holds small documents, such as cards and envelopes,

firmly against the platen. The single vertical line at the top
indicates the position of the line of printing, and its associated scale is especially useful when you are aligning a
printed form or reinserting a page.
Margin Stops

Push in and slide along margin scale until the mark on
the stop is aligned with the desired gradation on the scale.
Typing Position Indicator

A red arrow indicates the exact printing position of the
carrier.

LEFT
PLATEN
VARIABLE

LEFT
MARGIN----STOP
TYPING
POSITION
INDICATOR
MARGIN
SCALE

7

Typical keyboard for the Model 1021 series. Numerical keys and symbols may vary, depending on the
particular model and the typing element selected.

KEYBOARD CONTROLS
Power On/Off Switch and Indicator

Tab Key

This switch supplies power to the DURA 1021 Computer Terminal. When the switch is in the on position,
the red indicator light in the center of the Dura "d" nameplate glows.

To move the carrier to all previously set tab stops, or
through the right margin, depress the TAB key.

Index Key

The Index key is a two-level key used to advance the
paper vertically without carrier movement. Depress lightly
for single action; hold at second level for continuous vertical paper movement.

Shift Key

To shift the printing sphere from lower case to upper
case position, or vice versa, depress either the right or the
left Shift key.
Shift Lock Key

Depress the Shift Lock key to hold the printing sphere
in upper case position.

Carrier Return Key

Multiple Character Keys

To return the carrier to the left margin stop and advance
the paper vertically, depress the Carrier Return key.

There are two Multiple Character keys (scribed with two
sets of characters). The set of characters present is dependent on the typing element. When changing the element,
check to see which sets of characters apply.

Tab Control (+, -)

To set a tab stop, move the carrier to the desired position and depress the set (+) end of the TAB control. To
clear a tab stop, tab to the stop to be cleared and depress
the clear (-) end of the TAB control.. To clear all stops,
move the carrier to the extreme right, depress and hold
down the clear ( -) end of the TAB control, and depress the
carrier return key.

8

Backspace Key

To move the carrier to the left one space at a time,
depress the Backspace key.
Margin Release Key

To permit the carrier to move beyond the left or right
margin stops, depress the Margin Release key.

CHANGING THE TYPE STYLE
The DURA 1021 typing element can be replaced readily,
permitting various type faces to be used.
On the top of each typing element are shown the type
face, typewriter pitch number (10 characters per inch or 12
characters per inch), and an orientation arrow.

SPRING LEVERS

Removing the Typing Element

1. Turn off keyboard power.
2. Make sure the typing element is positioned in lower
case with the arrow pointing toward the piaten.
3. With spring·type element, squeeze the spring levers
together and lift upward to release the typing ele·
ment from the groove in the element post.
4. With lever-type element, raise element release lever
until it clicks into position, and use lever to lift element off of the post.

Installing the Typing Element

1. Make sure the system is in lower case.
2. Place the element on the element post with the arrow
on top pointing toward the platen.
3. To install the spring-type element, squeeze the spring
levers together and gently press down until the element snaps into place.
4. To install a lever-type element, raise the release lever
until it clicks, slip element into position on the post,
and close the lever~

Front Cover Plate

To remove, grasp front of cover plate and lift up
smartly.
To reinstall, slip prongs (on top rear edge of cover)
under the top casing, then push down until cover locks into
place.

9

CHANGING THE RIBBON CARTRIDGE
Changing the ribbon cartridge on your DURA 1021 is
quick, clean, and simple. The modern cartridge design
ID!lkes it unnecessary ever to touch the ribbon.
Removing Ribbon

1. Move the carrier to the center.
2. Turn off keyboard power.

RIBBON
POSITION
LEVER

Installing Ribbon

1. Hold the ribbon cartridge so that the exposed length
of ribbon faces the platen.
2. Slide the ribbon down through the ribbon guide slots
with the exposed ribbon between the card holder and
typing element.

3. Remove front cover plate.
4. Raise ribbon guide by shifting the ribbon change
lever to the right.
s. Lift ribbon cartridge straight up off of the ribbon
posts.
6. Ease ribbon through the ribbon guide slots.
7. Discard used cartridge.

RIBBON

REVERSE
LEVERS

3. Place the cartridge on the spindle and press down
firmly until it clicks into position.
4. To take up ribbon slack, turn either cartridge post in
the direction of the arrow.
S. Lower the ribbon guide into typing position by moving the ribbon position lever to the left.

RIBBON CONTROLS
The ribbon position lever has four settings. Position one
(extreme right) is for cutting stencils, and positions two,
three, and four cause the top, center, and bottom portions
of the ribbon to be used.
For longer fabric ribbon life change the setting of the
ribbon position lever frequently to allow the ribbon to reink itself.
Although ribbon travel is reversed automatically when
the ribbon has completely unwound, it may be reversed
manually by moving the ribbon reverse lever to the opposite position.

10

RIBBON
CHANGE
LEVER

CHANGING FILM RIBBON
When you see the cross-hatching on the ribbon trailer, it
is time to replace the ribbon. To change the ribbon, first
center the carrier and then turn off keyboard power. Carefully remove the top cover. Keep the paper bail against the
platen. Then follow these steps:
Removing Used Ribbon

1. Press LOAD lever to raise ribbon lifts.
2. Remove the ribbon from both ribbon lifts.
3. While turning the left (empty) core clockwise, gently
lift it from spindle.
4. Turn the right (plastic) spool clockwise· and lift it
from spindle.
S. Discard the used ribbon, the empty core, and the
plastic spool.

Installing New Ribbon

1. Before threading, carefully separate the empty clear
plastic spool from the ribbon.
2. Push the ribbon LOAD lever toward the platen (it
will lock into position) to lift the ribbon guides.
3. Drop the ribbon with the gray center core onto the
left spindle and guide the ribbon, using the clear
plastic spool (with printing on top), to the left of
the tension wire.
4. Continue holding the clear plastic spool and thread
ribbon through the left and right ribbon guides.
5. Guide the ribbon to the left and past the carrier
position post.
6. Continue around to the right of the ribbon guide
post.
7. Thread the ribbon carefully between the ribbon
feed rollers.
8. Place the clear plastic spool on the right spindle and
turn in a clockwise direction until it clicks into position.
9. Take up slack by turning the ribbon roll on the left
spindle clockwise.

10. Press against the CLOSE portion of the ribbon
LOAD lever.
11. The illustration shows the way the film ribbon will
look when it is correctly inserted and ready for use.
(The arrows indicate the direction in which the ribbon moves.)

11

CARE AND CLEANING OF YOUR DURA 1021 TYPEWRITER
A few simple steps will preserve the appearance of your
DURA 1021 Computer Terminal and will help keep it
operating at top efficiency.
To remove grease or ink stains from the case, use a mild
soap or liquid detergent, then wipe with a clean damp
sponge or cloth. Tape chad or dust may be removed by
gentle brushing.

Removing the Platen

1. Turn off keyboard power.
2. Bring forward the paper release lever and the paper
bail.
3. Remove top cover.
4. Depress the platen release levers and lift out platen.
Replacing the Platen

1. Position it with the ratchet teeth to your right.
2. Place groove of platen in the platen latch.
3. Press down on both ends of the platen until it snaps
into place.

Never use oil or cleaning fluids (except platen cleaner)
on your machine. Proper paper feed will be assured and
roller marks will be prevented by periodic cleaning of the
platen and feed rollers with platen cleaner available from
office supply dealers. This is done most easily if the platen
and feed rollers are first removed.

Replacing the Deflector Plate

If the deflector plate has been removed or jostled out of
place, make sure that:
1. Feed rollers are in place on the feed roller hangers,
with larger rollers in the rear.
2. Power is off and the paper release lever is forward.
3. The deflector plate is lowered in place with the
toothed edge toward you and the two tines on either
end straddling the grooves in the deflector shaft.
Cleaning the Erasure Dustpan

1. With keyboard power on, move typing element to
one end.
2. Turn off power and remove cover.
3. With the dual-purpose brush, sweep lightly toward
the front of the typewriter.
CAUTION: Do not allow your brush to interfere with the
thin wires.
Cleaning the Typing Element

Clip the typing element to the eraser end of a pencil.
With the typing element brush, brush away from you and
toward the top of the element.

12

Index
Card Holder
Care and Cleaning

7

8

Changing Type Style

9

Check Function

6

Code Charts

4

Deflector Plate

Erasure Dustpan

Film Ribbon

5

Operating Controls

5

Operating Procedures

2

Paper Bail

7

Paper Carrier Controls

7

Paper Guide

7

Paper Release Lever

7

Platen

7

12

Carrier Return

Data Flow Chart

NP/NE (Non Print/Non Escape)

6

12

12

11

Platen - Cleaning

12

Platen Variable

7

Power Switch

8

First Line

6

Shift

5

Front Cover Plate

9

Shift Keys and Lock

8

Reverse Index
Index Key

8

5

Interrupt

5

Keyboard Controls

8

Keyboard Layouts

3

Ribbon Cartridge

10

Ribbon Controls

10

Ribbon Shift

5

Timing

6

Type Style

9

Margin Release

8

Typing Element

9

Margin Stops

7

Typing Position Indicator

7

Mul tiple Character Keys

8

Typewriter Operation

7

13

'"

Intercontinental
Systems Inc.

~I'II'I'II!!~ DURA DIVISION

Printed in U.S.A.

MS·69278



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